CVE-2025-2259: Eclipse Threadx Netx Duo

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

In NetX HTTP server functionality of Eclipse ThreadX NetX Duo before version 6.4.3, an attacker can cause an integer underflow and a subsequent denial of service by writing a very large file, by specially crafted packets with Content-Length in one packet smaller than the data request size of the other packet. A possible workaround is to disable HTTP PUT support. This issue follows an incomplete fix of CVE-2025-0727

Affected products

• Eclipse Threadx Netx Duo: before 6.4.3 (fixed in 6.4.3)

Published 2025-04-06. Last modified 2026-06-17.